Debt - Schedule of Outstanding Borrowings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) warehouse	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Carrying Amount	$ 1,414,163
Total debt net of discount and deferred financing costs	1,398,227
Mortgage Notes and Term Loans
Debt Instrument [Line Items]
Carrying Amount	1,414,163	$ 1,753,955
Less deferred financing costs	(15,611)	(25,712)
Less debt discount	(325)	(6,285)
Total debt net of discount and deferred financing costs	1,398,227	1,721,958
Fair Value	$ 1,435,944	1,787,528
Mortgage Loans | 2010 Mortgage Loans
Debt Instrument [Line Items]
Debt Instrument, Collateral Number of Properties | warehouse	46
Mortgage Loans | Component A-1
Debt Instrument [Line Items]
Contractual Interest Rate	3.86%
Effective Interest Rate as of March 31, 2018	4.40%
Carrying Amount	$ 52,641	56,941
Fair Value	$ 53,299	58,151
Mortgage Loans | Component A-2-FX
Debt Instrument [Line Items]
Contractual Interest Rate	4.96%
Effective Interest Rate as of March 31, 2018	5.38%
Carrying Amount	$ 150,334	150,334
Fair Value	$ 157,475	159,918
Mortgage Loans | Component A-2-FL
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018	3.80%
Carrying Amount	$ 48,654	48,654
Fair Value	$ 48,958	49,019
Mortgage Loans | Component A-2-FL | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate	1.51%
Mortgage Loans | Component B
Debt Instrument [Line Items]
Contractual Interest Rate	6.04%
Effective Interest Rate as of March 31, 2018	6.48%
Carrying Amount	$ 60,000	60,000
Fair Value	$ 63,900	64,875
Mortgage Loans | Component C
Debt Instrument [Line Items]
Contractual Interest Rate	6.82%
Effective Interest Rate as of March 31, 2018	7.28%
Carrying Amount	$ 62,400	62,400
Fair Value	$ 67,704	68,718
Mortgage Loans | Component D
Debt Instrument [Line Items]
Contractual Interest Rate	7.45%
Effective Interest Rate as of March 31, 2018	7.92%
Carrying Amount	$ 82,600	82,600
Fair Value	$ 90,344	91,686
Mortgage Loans | 2013 Mortgage Loans
Debt Instrument [Line Items]
Debt Instrument, Collateral Number of Properties | warehouse	15
Mortgage Loans | Senior note
Debt Instrument [Line Items]
Contractual Interest Rate	3.81%
Effective Interest Rate as of March 31, 2018	4.14%
Carrying Amount	$ 192,654	194,223
Fair Value	$ 190,245	195,194
Mortgage Loans | Mezzanine A
Debt Instrument [Line Items]
Contractual Interest Rate	7.38%
Effective Interest Rate as of March 31, 2018	7.55%
Carrying Amount	$ 70,000	70,000
Fair Value	$ 67,900	68,950
Mortgage Loans | Mezzanine B
Debt Instrument [Line Items]
Contractual Interest Rate	11.50%
Effective Interest Rate as of March 31, 2018	11.75%
Carrying Amount	$ 32,000	32,000
Fair Value	$ 31,360	31,840
Term Loans | Australia Term Loan
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018	4.59%
Carrying Amount	$ 156,046	158,645
Fair Value	$ 157,607	160,628
Term Loans | Australia Term Loan | BBSY
Debt Instrument [Line Items]
Contractual Interest Rate	1.40%
Term Loans | New Zealand Term Loan
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018	5.15%
Carrying Amount	$ 31,834	31,240
Fair Value	$ 32,152	31,631
Term Loans | New Zealand Term Loan | BKBM
Debt Instrument [Line Items]
Contractual Interest Rate	1.40%
Term Loans | 2015 Senior Secured Term Loan B Facility
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018	5.79%
Carrying Amount	$ 0	806,918
Fair Value	$ 0	806,918
Term Loans | 2015 Senior Secured Term Loan B Facility | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate	3.75%
Line of Credit | 2018 Senior Secured Term A Facility secured by stock pledge in qualified subsidiaries
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018	4.90%
Carrying Amount	$ 475,000	0
Fair Value	$ 475,000	0
Line of Credit | 2018 Senior Secured Term A Facility secured by stock pledge in qualified subsidiaries | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate	2.50%
Line of Credit | 2018 Senior Secured Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total debt net of discount and deferred financing costs	$ 0	0
Fair Value	0	0
Construction Loan
Debt Instrument [Line Items]
Less deferred financing costs		$ (179)
Construction Loan | Warehouse Clearfield, UT
Debt Instrument [Line Items]
Effective Interest Rate as of March 31, 2018		5.18%
Carrying Amount	0	$ 19,671
Less deferred financing costs	0	(179)
Total debt net of discount and deferred financing costs	0	19,492
Fair Value	$ 0	$ 19,671
Construction Loan | Warehouse Clearfield, UT | LIBOR
Debt Instrument [Line Items]
Contractual Interest Rate	3.25%